diff --git a/eth/api.go b/eth/api.go
index 1892746602cfb..818df89c07c94 100644
--- a/eth/api.go
+++ b/eth/api.go
@@ -52,17 +52,17 @@ func NewPublicEthereumAPI(e *Ethereum) *PublicEthereumAPI {
 	return &PublicEthereumAPI{e}
 }
 
-// Etherbase is the address that mining rewards will be send to
+// Etherbase is the address that mining rewards will be send to.
 func (api *PublicEthereumAPI) Etherbase() (common.Address, error) {
 	return api.e.Etherbase()
 }
 
-// Coinbase is the address that mining rewards will be send to (alias for Etherbase)
+// Coinbase is the address that mining rewards will be send to (alias for Etherbase).
 func (api *PublicEthereumAPI) Coinbase() (common.Address, error) {
 	return api.Etherbase()
 }
 
-// Hashrate returns the POW hashrate
+// Hashrate returns the POW hashrate.
 func (api *PublicEthereumAPI) Hashrate() hexutil.Uint64 {
 	return hexutil.Uint64(api.e.Miner().Hashrate())
 }
@@ -136,7 +136,7 @@ func (api *PrivateMinerAPI) SetGasLimit(gasLimit hexutil.Uint64) bool {
 	return true
 }
 
-// SetEtherbase sets the etherbase of the miner
+// SetEtherbase sets the etherbase of the miner.
 func (api *PrivateMinerAPI) SetEtherbase(etherbase common.Address) bool {
 	api.e.SetEtherbase(etherbase)
 	return true
@@ -160,7 +160,7 @@ func NewPrivateAdminAPI(eth *Ethereum) *PrivateAdminAPI {
 }
 
 // ExportChain exports the current blockchain into a local file,
-// or a range of blocks if first and last are non-nil
+// or a range of blocks if first and last are non-nil.
 func (api *PrivateAdminAPI) ExportChain(file string, first *uint64, last *uint64) (bool, error) {
 	if first == nil && last != nil {
 		return false, errors.New("last cannot be specified without first")
@@ -328,7 +328,7 @@ type BadBlockArgs struct {
 }
 
 // GetBadBlocks returns a list of the last 'bad blocks' that the client has seen on the network
-// and returns them as a JSON list of block-hashes
+// and returns them as a JSON list of block hashes.
 func (api *PrivateDebugAPI) GetBadBlocks(ctx context.Context) ([]*BadBlockArgs, error) {
 	var (
 		err     error
diff --git a/eth/downloader/api.go b/eth/downloader/api.go
index 2024d23deade6..645912286d574 100644
--- a/eth/downloader/api.go
+++ b/eth/downloader/api.go
@@ -159,7 +159,7 @@ func (s *SyncStatusSubscription) Unsubscribe() {
 }
 
 // SubscribeSyncStatus creates a subscription that will broadcast new synchronisation updates.
-// The given channel must receive interface values, the result can either
+// The given channel must receive interface values, the result can either.
 func (api *PublicDownloaderAPI) SubscribeSyncStatus(status chan interface{}) *SyncStatusSubscription {
 	api.installSyncSubscription <- status
 	return &SyncStatusSubscription{api: api, c: status}